QE-DEF-0285 The logon failed.
Microsoft SQL Server (Native Client) / Compatible
when you get above error while you are testing cognos service – Mostly this could be because you didnt install SQL server native client on your machine.
to check if it is installed or not: Type for odbc. Open odbc (32 bit) ad odbc(64 bit). go to drivers tab. Check if ‘SQl server Native client’ is available. If not then install SQL server native client.
file name – sqlncli
Data Engineering and BI BLOG 